added base dialog class

src/lib/dialog/base-dialog.component.ts

@@ -0,0 +1,19 @@
+import { Directive, HostListener } from '@angular/core';
+import { FormGroup } from '@angular/forms';
+import { IqserEventTarget } from '@iqser/common-ui';
+
+@Directive()
+export abstract class BaseDialogComponent {
+
+    abstract form: FormGroup;
+    abstract get changed(): boolean;
+    abstract save(): void;
+
+    @HostListener('window:keydown.Enter', ['$event'])
+    onEnter(event: KeyboardEvent): void {
+        const node = (event.target as IqserEventTarget).localName;
+        if (this.form.valid && this.changed && node !== 'textarea') {
+            this.save();
+        }
+    }
+}